On April 20, all petrifying attacks of monsters have the same effects they do on a new moon, i.e. making stoning more likely.

New monster ‘chicken’, added to the c monster class, but it is a normal chicken with no special attributes or powers. Eating its corpse gives some chicken related YAFM, and wielding its corpse and hitting a monster with it may make them flee; a comment in the code should indicate that this is because they are “chickening out”.